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sort.go
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sort.go
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package promrelabel
import (
"sort"
"sync"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
)
// SortLabels sorts labels.
func SortLabels(labels []prompbmarshal.Label) {
ls := labelsSorterPool.Get().(*labelsSorter)
*ls = labels
if !sort.IsSorted(ls) {
sort.Sort(ls)
}
*ls = nil
labelsSorterPool.Put(ls)
}
// SortLabelsStable sorts labels using stable sort.
func SortLabelsStable(labels []prompbmarshal.Label) {
ls := labelsSorterPool.Get().(*labelsSorter)
*ls = labels
if !sort.IsSorted(ls) {
sort.Stable(ls)
}
*ls = nil
labelsSorterPool.Put(ls)
}
var labelsSorterPool = &sync.Pool{
New: func() interface{} {
return &labelsSorter{}
},
}
type labelsSorter []prompbmarshal.Label
func (ls *labelsSorter) Len() int { return len(*ls) }
func (ls *labelsSorter) Swap(i, j int) {
a := *ls
a[i], a[j] = a[j], a[i]
}
func (ls *labelsSorter) Less(i, j int) bool {
a := *ls
return a[i].Name < a[j].Name
}